This publication covers requirements and considerations for design and maintenance of indexed pin-type noninterchangeable welding quick-action couplings. It is the intention of this standard to provide some minimum guidance because of the various designs that exist. This standard applies to quick-connect couplings with integral CGA E-1 or ISO 3253 connections used between regulators, torches and/or other gas welding equipment, sometimes referred to as hose-type quick-connects, for pressures up to 200 psi (1380 kPa).